mon, osd: add create-time for pool

We want to know how old the pools currently are, on which mgr/balancer
can make some time-related smart decisions based.

Signed-off-by: xie xingguo <xie.xingguo@zte.com.cn>

src/mon/OSDMonitor.cc

@@ -6470,6 +6470,7 @@ int OSDMonitor::prepare_new_pool(string& name, uint64_t auid,
   int64_t pool = ++pending_inc.new_pool_max;
   pg_pool_t empty;
   pg_pool_t *pi = pending_inc.get_new_pool(pool, &empty);
+  pi->create_time = ceph_clock_now();
   pi->type = pool_type;
   pi->fast_read = fread; 
   pi->flags = g_conf->osd_pool_default_flags;

src/osd/osd_types.cc

@@ -1163,6 +1163,7 @@ const char *pg_pool_t::APPLICATION_NAME_RGW("rgw");
 
 void pg_pool_t::dump(Formatter *f) const
 {
+  f->dump_stream("create_time") << get_create_time();
   f->dump_unsigned("flags", get_flags());
   f->dump_string("flags_names", get_flags_string());
   f->dump_int("type", get_type());
@@ -1554,7 +1555,7 @@ void pg_pool_t::encode(bufferlist& bl, uint64_t features) const
     return;
   }
 
-  uint8_t v = 26;
+  uint8_t v = 27;
   // NOTE: any new encoding dependencies must be reflected by
   // SIGNIFICANT_FEATURES
   if (!(features & CEPH_FEATURE_NEW_OSDOP_ENCODING)) {
@@ -1563,6 +1564,8 @@ void pg_pool_t::encode(bufferlist& bl, uint64_t features) const
     v = 21;
   } else if (!HAVE_FEATURE(features, SERVER_LUMINOUS)) {
     v = 24;
+  } else if (!HAVE_FEATURE(features, SERVER_MIMIC)) {
+    v = 26;
   }
 
   ENCODE_START(v, 5, bl);
@@ -1638,12 +1641,15 @@ void pg_pool_t::encode(bufferlist& bl, uint64_t features) const
   if (v >= 26) {
     encode(application_metadata, bl);
   }
+  if (v >= 27) {
+    encode(create_time, bl);
+  }
   ENCODE_FINISH(bl);
 }
 
 void pg_pool_t::decode(bufferlist::iterator& bl)
 {
-  DECODE_START_LEGACY_COMPAT_LEN(26, 5, 5, bl);
+  DECODE_START_LEGACY_COMPAT_LEN(27, 5, 5, bl);
   decode(type, bl);
   decode(size, bl);
   decode(crush_rule, bl);
@@ -1793,6 +1799,9 @@ void pg_pool_t::decode(bufferlist::iterator& bl)
   if (struct_v >= 26) {
     decode(application_metadata, bl);
   }
+  if (struct_v >= 27) {
+    decode(create_time, bl);
+  }
   DECODE_FINISH(bl);
   calc_pg_masks();
   calc_grade_table();
@@ -1803,6 +1812,7 @@ void pg_pool_t::generate_test_instances(list<pg_pool_t*>& o)
   pg_pool_t a;
   o.push_back(new pg_pool_t(a));
 
+  a.create_time = utime_t(4,5);
   a.type = TYPE_REPLICATED;
   a.size = 2;
   a.crush_rule = 3;

src/osd/osd_types.h

@@ -1295,6 +1295,7 @@ struct pg_pool_t {
     }
   }
 
+  utime_t create_time;
   uint64_t flags;           ///< FLAG_*
   __u8 type;                ///< TYPE_*
   __u8 size, min_size;      ///< number of osds in each pg
@@ -1456,6 +1457,7 @@ struct pg_pool_t {
 
   void dump(Formatter *f) const;
 
+  const utime_t &get_create_time() const { return create_time; }
   uint64_t get_flags() const { return flags; }
   bool has_flag(uint64_t f) const { return flags & f; }
   void set_flag(uint64_t f) { flags |= f; }